Atkins has been involved in tunnelling projects globally since 1961, with over 780km of completed work, including significant projects like the Crossrail in London and the Channel Tunnel connecting the UK and France. The document highlights various projects across different countries, detailing their scope, challenges, and contributions, such as improving infrastructure and enhancing public transport systems. Key projects mentioned include the Dublin Metro, Gautrain in South Africa, and the Harbour Area Treatment Scheme in Hong Kong.